All big cities look pretty much the same. A lot of people come to the city center during daytime, to sell things, to do business, and then by the evening, they are gone. It is a circus that happens every day.
We reached Bogota very early in the morning; had to wake up the night duty receptionist. The hotel was mostly empty, and we were upgraded to a better room free of charge. Next day we got up late, but still managed to walk around and see a few things before it turned dark.